Electronic Distribution and Summing Element (EDSE).

The EDSE module consists of an 11 by 13.6 inch stitchwire card with voltage and ground planes and with 175 dual-in-line ICs installed. The module has an interface capability of 176 lines, provided by two 88 pin connectors. The ICs used in the EDSE module are 10,000 series ECL circuits with a basic master clock rate of 26 MHz. This was required so that the EDSE could be used in a simulated hydrophone array as large as 2048 hydrophones. The EDSE module contains the digital circuitry to simulate two hydrophone outputs, plus interface with an input data source and other EDSE modules in the acoustic array simulator. A more detailed description of the EDSE module circuits and operation and timing is found in the EDSE Technical Manual. An EDSE Self-Test Chassis and a Self-Test module were constructed to checkout and self-test the EDSE module. The self-test chassis contains a muffin fan for cooling the EDSE module during test. The cooling fan was considered necessary since the EDSE module draws approximately 15 amps at -5 volt power during operation. During testing, it was found that the EDSE module stabilized at approximately 65 C during operation with the cooling fan turned off. The module exhibited no malfunctions due to operating at this elevated temperature.